function XY(){
	this._x=new Amount().value(0);
	this._y=new Amount().value(0);
	this.x=function(newValue){	
		if(newValue!=undefined){
			if(newValue instanceof Amount){this._x.bind(newValue);return this;}
			else{this._x.value(newValue);return this;}
			}
		else return this._x;
		};
	this.y=function(newValue){		
		if(newValue!=undefined){
			if(newValue instanceof Amount){this._y.bind(newValue);return this;}
			else{this._y.value(newValue);return this;}
			}
		else return this._y;
		};
	}